commit 3e77ba96d56d15db30ac6d8ccb900e30aafcbb16
author vbuzinov <vbuzinov@nvidia.com> Wed Sep 30 23:02:06 2015 -0700
committer Commit bot <commit-bot@chromium.org> Wed Sep 30 23:02:06 2015 -0700
tree d70cd72b103537c691d7919625244d2f82238c65
parent 6634cbb427d97f88b6f719fc34ff9b8dbcf8a1f4

Implement stencil clipping in mixed sampled render targets

This change enables multisampled clipping for mixed sampled
render targets.  Previously clipping in mixed samples config
behaved the same as in the gpu config.

In order to retrofit non-MSAA draw methods, programmable sample
locations are used in order to colocate all samples at (0.5, 0.5).
Requires support for NV_sample_locations.

BUG=skia:4399

Review URL: https://codereview.chromium.org/1232103002

include/gpu/GrCaps.h

diff --git a/include/gpu/GrCaps.h b/include/gpu/GrCaps.h
index 248135d..0f376f9 100644
--- a/include/gpu/GrCaps.h
+++ b/include/gpu/GrCaps.h
@@ -63,6 +63,7 @@
     bool dstReadInShaderSupport() const { return fDstReadInShaderSupport; }
     bool dualSourceBlendingSupport() const { return fDualSourceBlendingSupport; }
     bool mixedSamplesSupport() const { return fMixedSamplesSupport; }
+    bool programmableSampleLocationsSupport() const { return fProgrammableSampleLocationsSupport; }
 
     /**
     * Get the precision info for a variable of type kFloat_GrSLType, kVec2f_GrSLType, etc in a
@@ -93,6 +94,7 @@
     bool fDstReadInShaderSupport : 1;
     bool fDualSourceBlendingSupport : 1;
     bool fMixedSamplesSupport : 1;
+    bool fProgrammableSampleLocationsSupport : 1;
 
     bool fShaderPrecisionVaries;
     PrecisionInfo fFloatPrecisions[kGrShaderTypeCount][kGrSLPrecisionCount];

include/gpu/gl/GrGLFunctions.h

diff --git a/include/gpu/gl/GrGLFunctions.h b/include/gpu/gl/GrGLFunctions.h
index aea6d2c..7fe82d6 100644
--- a/include/gpu/gl/GrGLFunctions.h
+++ b/include/gpu/gl/GrGLFunctions.h
@@ -390,6 +390,8 @@
 typedef GrGLvoid (GR_GL_FUNCTION_TYPE* GrGLGetVertexArrayPointeri_vProc)(GrGLuint vaobj, GrGLuint index, GrGLenum pname, GrGLvoid **param);
 typedef GrGLvoid* (GR_GL_FUNCTION_TYPE* GrGLMapNamedBufferRangeProc)(GrGLuint buffer, GrGLintptr offset, GrGLsizeiptr length, GrGLbitfield access);
 typedef GrGLvoid (GR_GL_FUNCTION_TYPE* GrGLFlushMappedNamedBufferRangeProc)(GrGLuint buffer, GrGLintptr offset, GrGLsizeiptr length);
+// OpenGL 4.5
+typedef GrGLvoid (GR_GL_FUNCTION_TYPE* GrGLNamedFramebufferParameteriProc)(GrGLuint framebuffer, GrGLenum pname, GrGLint param);
 
 /* KHR_debug */
 typedef GrGLvoid (GR_GL_FUNCTION_TYPE* GrGLDebugMessageControlProc)(GrGLenum source, GrGLenum type, GrGLenum severity, GrGLsizei count, const GrGLuint* ids, GrGLboolean enabled);

include/gpu/gl/GrGLInterface.h

diff --git a/include/gpu/gl/GrGLInterface.h b/include/gpu/gl/GrGLInterface.h
index bdbedd9..c4748c7 100644
--- a/include/gpu/gl/GrGLInterface.h
+++ b/include/gpu/gl/GrGLInterface.h
@@ -490,6 +490,8 @@
         GLPtr<GrGLGetVertexArrayPointeri_vProc> fGetVertexArrayPointeri_v;
         GLPtr<GrGLMapNamedBufferRangeProc> fMapNamedBufferRange;
         GLPtr<GrGLFlushMappedNamedBufferRangeProc> fFlushMappedNamedBufferRange;
+        // OpenGL 4.5
+        GLPtr<GrGLNamedFramebufferParameteriProc> fNamedFramebufferParameteri;
 
         /* KHR_debug */
         GLPtr<GrGLDebugMessageControlProc> fDebugMessageControl;